So, I've recently purchased a DSMB but I could never fully inflate it in water. I know I only need to get halfway full but even then I could not get it. So the DSMB was always flat on the surface and it is very very annoying. I tried the open end, using the LP hose but none of those works. The DSMB always brings me up before I can get halfway full. This DSMB has 130lbs of the lift so whatever I do I couldn't pull on it long enough until it gets inflated. Note: This DSMB is 3 times longer than a Halcyon and 6 times larger in volumes.